#include <stdio.h>

int add(int a, int b)
{
	int s;
	s = a + b;
	return s;
}

int main(int argc, char* argv[])
{
	int aa = 10;
	int bb = 20;
	int sum;
	sum = add(aa, bb);
	printf("sum = %d\n", sum);
	return 0;
}
